package zhklappoint.initsys;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import zhklappoint.annotation.LoginUser;
import zhklappoint.entity.WXUser;
import zhklappoint.service.WXUserService;


/**
 * 有@LoginUser注解的方法参数，注入当前登录用户
 */
@Component
public class LoginUserHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
	
	@Autowired
    private WXUserService userService;
	
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterType().isAssignableFrom(WXUser.class) && parameter.hasParameterAnnotation(LoginUser.class);
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer container,
                                  NativeWebRequest request, WebDataBinderFactory factory) throws Exception {
        //获取用户ID
        Object object = request.getAttribute(WxApiInterceptors.LOGIN_USER_KEY, RequestAttributes.SCOPE_REQUEST);
        if (object == null) {
            return null;
        }
        //获取用户信息
        WXUser user = userService.findById(object+"");
        return user;
    }
}
